<template>
  <el-container class="home-container">
    <!-- 头部 -->
    <el-header >
      <div>
        <img src="~assets/heima.png">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <!-- 控制侧边栏显示隐藏 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu :collapse-transition="false" :router="true" 
        :collapse="isCollapse" unique-opened background-color="#333744" 
        text-color="#fff" active-text-color="#409eff" 
        :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 导航文字 -->
              <span>{{item.authName}}</span>
            </template> 
            <!-- 二级菜单           -->
            <el-menu-item @click="saveNavState('/' + subItem.path)" :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id">
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 导航文字 -->
                <span>{{subItem.authName}}</span>
              </template> 
            </el-menu-item>
          </el-submenu>
    </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
import { getHttpMenuList } from 'network/home'
export default {
  name: 'Home',
  data() {
    return {
      //左侧菜单数据
      menulist: [],
      //左侧一级菜单图标
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      isCollapse: false, //是否折叠侧边栏
      activePath: '' //激活的二级菜单地址
    }
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    //获取所有的菜单
    getMenuList() {
      getHttpMenuList().then(res => {
        if(res.meta.status !== 200) {
          this.$message.error(res.meta.msg)
          return
        }
        else{
          this.menulist = res.data
        }
      }).catch(err => {
        this.$message.error(err)
      })
    },
    //打开隐藏侧边栏
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    //保存二级菜单的点击选中地址
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>